Perhaps you should try some spelling variations:
"tong khoi can snippets" » "xong khoi can snippets", "tuong khoa can snippets", "thong khoa can snippets", "tong khoa can snippets", "tong khoi nang snippets", "tong hoc can snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("tong khoi can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tong khoi can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tong khoi can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tong khoi can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.